There are a lot of characters from many different universes that look and/or act alike. I've been keeping track for awhile, but never really found the time to write them down.

Rules: 1) No clashing universes!! Yes, Percy and Jason could be twins, but I am looking for the less obvious matches. 2) One twin per character. 3) An antagonist cannot be a good twin, but a protagonist can be an evil twin. Because of this, an antagonist cannot be paired with another antagonist.

KEY: {Good Twin (Universe)} <-> {Evil Twin (Universe)}

KEEP IN MIND that not all of the evil twins are villains!! Some of them are listed as evil because of their style, potential, personality, or because I could find little to no flaws in the other character. Explanations for these cases are explained below.

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Link (The Legend of Zelda) <-> Kirito/Kazuto (Sword Art Online)

Zelda (The Legend of Zelda) <-> Asuna (Sword Art Online)

Navi (The Legend of Zelda) <-> Yui (Sword Art Online)

Howl (Howl's Moving Castle) <-> Kaname (Vampire Knight)

Legolas (The Lord of the Rings) <-> Lucius Malfoy (Harry Potter)

Dumbledore (Harry Potter) <-> Saruman (The Lord of the Rings)

Sherlock Holmes (Sherlock Holmes) <-> Artemis Fowl (Artemis Fowl)

Holly (Artemis Fowl) <-> Reyna (Rick Riordan; Heroes of Olympus)

Commander Vinyaya (Artemis Fowl) <-> Zoe (Rick Riordan; Percy Jackson)

Commander Root (Artemis Fowl) <-> Mr. D/Dionysus (Rick Riordan; Percy Jackson & Heroes of Olympus)

The White Queen (Alice in Wonderland) <-> Effie Trinket (Hunger Games)

Fin (Star Wars) <-> Thresh (Hunger Games)

Tamaki Suou (Ouran High School Club) <-> Hanabusa Aido/Idol (Vampire Knight)

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Explanations:

Kirito is evil, mainly because of episode 22 of SAO. His style is fierce, and he'll do anything to save those he loves and cares about. I also couldn't find a single thing evil about Link.

Asuna is evil because of her attitude, as well as me not being able to find anything evil about Zelda.

Yui is evil because she is a CPU that can feel human emotions, and therefore has the potential of being evil. An example of this is episode 12 of SAO. Furthermore, I could not find anything evil about Navi (and no, I don't count "she's annoying" as an evil trait).

Kaname is evil because he definitely has the potential to be one, as shown in many different episodes.

Artemis Fowl is evil because has the potential to be evil, as he shows many times throughout his books. The author even revealed that he was meant to be neither a villain nor a hero. I also don't know a thing about Sherlock except that he's smart and likes to show off, so it would be unfair to label him as evil with so little knowledge of his character.

Reyna is evil because she also has the potential to be evil as she shows in The Son of Neptune, whereas Holly is too soft to be evil.

Zoe is evil because of her personality and attitude, especially towards men. Commander Vinyaya is a minor character, so it would be unfair to label her as evil with so little information on her character.

Dionysus is evil because of his personality, though he came really close to switching terms with Root. He is also a god, so he could technically become evil, whereas Root is only the way he is to help Holly.

Effie is evil because she has the potential to be a villain, as did Caesar Flickerman. Additionally, the White Queen has no flaws except the lie about the tarts - that's why she's the white queen.

Thresh is evil because of his potential and style. The only thing wrong with Fin is that he was a Stormtrooper, but then again, he had no choice, and then chose to leave.

Idol is evil because he's a vampire, giving him the potential to be evil.

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--Breaking rules--

New Rule: Only evil twins. No good twins.

KEY: {Evil Twin (Universe)} & {Evil Twin (Universe)}

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Ghirahim (The Legend of Zelda) & Sugou (Sword Art Online)